Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e4ec390c642f9cb6053d24e03f268528d8b8e99831027ec5ef3ba62a59a3531' 
  AND token = '9urMkk59GyhnlFnNn7+vOgu8EkuW8+iMgQoBaYQoBRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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