SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62bc209fb5bad770870e3406a17c41c9cd3abace7a3e94491d7d134b453c506b' 
  AND token = 'DB15SCuJfKQWRtnLS79h+q6wjxl95vWlIJTQkA1IuVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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