Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdb657c9f4d15586a8fd40696b64c0d4a6787ce409e7d477d990b1b2bef0f36c' 
  AND token = 'DZAEU0taQUc1QgYpJ1YdvZxureiyVZdsuo0cIEEQ9rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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