SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e1dce134a97966957c716a15c590d3eb79c748264b2963bb8c3765a4d3f73f2' 
  AND token = 'FX4UaBofqWvHo8ZJpGNwj58cknWYCRhVvrEtgRAR7WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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