SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da64c47d5b899f1f8baee320f885f53eaff0e7e33cd5160bf55085d8ed32f14b' 
  AND token = 'zqH1Y0DlLwUsye/D+UqoG2+LYliyHO+ohKUnXpjBkmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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