SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a94b9a10e2cf06dc71550f0c1f93265d386912ba4250fddfb042b5ca17d90cb' 
  AND token = '1ZwGUF6lHHiHAgODgvWpuTAIGRK0QR4/wPnYOdruXsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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