SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '042c005866bd7fd4240f5ef5c0fba4ac98b9431ab5c86a948d8fa45930483267' 
  AND token = 'K8gmAngHHbeIIEGpo/ZQWIIDQyl9ASHrPvWhySvLPAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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