find by props meta

$meta_query = array(
	'relation' => 'AND',
	array(
		'key'     => 'smolblog_import_key',
		'value'   => 'import_key',
	),
	array(
		'key'     => 'smolblog_reblog',
		'value'   => 'reblog',
	),
	array(
		'key'     => 'key',
		'value'   => 'value',
	),
);