SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f98b41e6e5c14da9377bb89566aed50371a11f2f4bdebc78d2d3296e396f7e8' 
  AND token = 'VthT0IUGxqU+agCZU2ey9T2Ui6i0GGraAzB2JlI9qnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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