I created this Account Search Lightning Component from a trailhead and I am wondering if there is a way to add some filter criteria to only find accounts that have a checkbox checked on the account record. I am looking for help to add this to the code below. 

Lightning Component:

<aura:component controller="AccountSearchController">
    <aura:registerEvent name="accountsLoaded" type="c:AccountsLoaded"/>
    <aura:handler name="init" value="{!this}" action="{!c.onInit}"/>
    <aura:attribute name="searchTerm" type="String" default="Cranston"/>
    <lightning:card title="Account Search" iconName="standard:search">
        <div class="slds-form slds-p-around_x-small">
            <lightning:input
                label="Search"
                variant="label-hidden"
                value="{!v.searchTerm}"
                placeholder="Search by name, phone, website, or address"
                onchange="{!c.onSearchTermChange}"/>
        </div>
    </lightning:card>
</aura:component>

Controller:

({
    onInit: function( component, event, helper ) {
        // proactively search on component initialization
        var searchTerm = component.get( "v.searchTerm" );
        helper.handleSearch( component, searchTerm );
    },
    onSearchTermChange: function( component, event, helper ) {
        // search anytime the term changes
        var searchTerm = component.get( "v.searchTerm" );
        // to improve performance, particularly for fast typers,
        // we wait a small delay to check when user is done typing
        var delayMillis = 500;
        // get timeout id of pending search action
        var timeoutId = component.get( "v.searchTimeoutId" );
        // cancel pending search action and reset timer
        clearTimeout( timeoutId );
        // delay doing search until user stops typing
        // this improves client-side and server-side performance
        timeoutId = setTimeout( $A.getCallback( function() {
            helper.handleSearch( component, searchTerm );
        }), delayMillis );
        component.set( "v.searchTimeoutId", timeoutId );
    }
})

Here is the Account List Code in case it is needed 
 

<aura:component>
    <aura:handler event="c:AccountsLoaded" action="{!c.onAccountsLoaded}"/>
    <lightning:navigation aura:id="navigation"/>
    <aura:attribute name="rows" type="Map[]"/>
    <aura:attribute name="cols" type="Map[]"/>
    <lightning:card title="Account List" iconName="standard:account">
        <lightning:datatable
            data="{!v.rows}"
            columns="{!v.cols}"
            keyField="Id"
            hideCheckboxColumn="true"
            showRowNumberColumn="true"
            onrowaction="{!c.onRowAction}"/>
    </lightning:card>
</aura:component>

 

({
    onAccountsLoaded: function( component, event, helper ) {
        var cols = [
            {
                'label': 'Name',
                'fieldName': 'Name',
                'type': 'text'
            },
            {
                'label': 'Phone',
                'fieldName': 'Phone',
                'type': 'phone'
            },
            {
                'label': 'Website',
                'fieldName': 'Website',
                'type': 'url'
            },
            {
                'label': 'Action',
                'type': 'button',
                'typeAttributes': {
                    'label': 'View details',
                    'name': 'view_details'
                }
            }
        ];
        component.set( 'v.cols', cols );
        component.set( 'v.rows', event.getParam( 'accounts' ) );
    },
    onRowAction: function( component, event, helper ) {
        var action = event.getParam( 'action' );
        var row = event.getParam( 'row' );
        if ( action.name == 'view_details' ) {
            var navigation = component.find( 'navigation' );
            navigation.navigate({
                'type': 'standard__recordPage',
                'attributes': {
                    'objectApiName': 'Account',
                    'recordId': row.Id,
                    'actionName': 'view'
                }
            });
        }
    }
})