SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3d01756e858e3d40b9eac8812cb960b5a624701845e5f9c32d4896e1d5a3d81' 
  AND token = 'F6z9VNP7AGjnUneRSh/ci0gdOMj9h/YgkgB+E2zSvQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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