SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f4671b351ab6d971eca65b243a28c233c02dd61cc223d23d12f0f646b3fd7a5' 
  AND token = 'YRKLzTaD+zu706UwHieFJixMrfUo5b5r/AXGCYmZrhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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