SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '844924c96072d33adb9b3f569873e890414454ebf9b3b20598f7f5ad418c32ff' 
  AND token = '4B8qOSJBSAEa6LTIaPP7FMXDPGdyjqm+UjhJTVuEeKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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