Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81158e07256ca82606555961a10f687d019563913254c4d11c0c0685eea2a3c3' 
  AND token = 'vlhuLL2TUvOKuiS6RgStX9fFQYZUktYpOEaY579mHYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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