SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9419c492805f1fa4a2efa41f38fd61b7c40261d7b7be497f31c9c8b8f83dcc8b' 
  AND token = 'gYIYv0p9SGm/hr7WatzL6gLGCs+L+If98ZwZdnNlEDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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