Displaying Posts Using a Custom Query with a Custom Field and a term_id

$args = array(
    'post_type' => 'locali',
    'meta_query' => array(
        array(
            'key' => 'apecard',
            'value' => 'on',
        )
    ),
    'tax_query' => array(
        array(
            'taxonomy' => 'yourtaxonomy',
            'field' => 'id',
            'terms' => array('143')
        )
    )
);
$postslist = get_posts( $args );