SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c95e0c071a9f9fa4a3551d921e023ced2ea5e60200e3d210c04f89ec1c10bdbb' 
  AND token = '1mBDYGjAjzq9H8xU05M4bVwuWKgFDzs8+lgK+qx5Soo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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