SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11b39bc3e664a28f30af7287a1a21e18114585ab2c790644f98654d794f6dec3' 
  AND token = '10ogmUHzRz4S3U+HQLuiVrSRK0J0XW4GoaphboxrANQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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