SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14af603a9cb275bfce0a44d8b81ebd02a83e9a10198f76136c59a776882a2d8a' 
  AND token = '+Xakvjg14DhRFdnwuKHPYBJxbTA5A0wAsrTB/PniWuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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