SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce3ca4df51c3893cb25aeaec2ffd6480964076ebb29a2a088739e0a333679a8f' 
  AND token = 'mTXpzSFiOSZPVKGp0lYsZjBWhpUk8yZDE7TMak+jDog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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