SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '940b26b96e91415d674e02e8de359284304801eb6dc8ad76ba3115ff6edb1cbb' 
  AND token = 'mi5zw6fWBnb+SBxWGShpo/IDZU+72GFU8ICfmGTmLP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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