SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49707652ebc3e4aaa7e7b9b30658367e55df7e405c693c5a4f4d02f8dbe27cd3' 
  AND token = 'Gej7n1Kv+xxWxKhDOaYwn1ttVjLrBwh71k044lJxXN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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