SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37d0bb8d2c700f2a6bd9abfb10de5bf47f581b6e143c8e7e778e1a9549d83b93' 
  AND token = 'auj+B6qvAlAN+FzwbYk30JAjiRmjLje+lvPBilTWLeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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