SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbd8a34fa924fc4e5df5cf80ff2104f195b1c3d63033296b7152052ade27bff9' 
  AND token = 'FrOBk4OSIXwhxEIUGDUi+M9LNDLHCRC4MUh9m6V+ZD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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