<php

\Bitrix\Iblock\ElementTable::GetList([
	'filter' => [
		'ACTIVE' => 'Y',
		[
			"LOGIC" => "OR",
			'<ACTIVE_FROM' => new \Bitrix\Main\DB\SqlExpression("NOW()"),
			'ACTIVE_FROM' => null,
		],
		[
			"LOGIC" => "OR",
			'>ACTIVE_TO' => new \Bitrix\Main\DB\SqlExpression("NOW()"),
			'ACTIVE_TO' => null,
		],
	]
])