SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89937e6eeaf6e46397a3518bc3e00fdde407342976b740d9a14c8716a7632bc2' 
  AND token = 'ilCVGIfnqQGN6KuARP3/SHHh4qov6brhfmbJ5EVsRgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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