Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c661c75c1c38d1a8d815ac05a8d55f7b78c3a37d687f4a08d1265614641e9db6' 
  AND token = 'XLc6Bxs4sXQa9gkGCixPDyRVsCgVgWCbIgP/qjRMCUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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