SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41494d61d50db172f9b94a876a9c5d893f72f52d46f013590d7e72803c440d34' 
  AND token = 'VR2+OqrstMPjI+l7u95eXZVqV4ohWHf8Kj1wTrTbTF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}