Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb4cd974ae3d39c6a3bdb9962c4660c090570a582dc8a90fb00fe86fa68571bb' 
  AND token = '+sXhHdNJmwTeFSKOKkKSZWcOsygKeg5ZcTEa5QJCmNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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