SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10915d2c7f0c45858265e082d7f7507eb1867caec5c0427ebad9787eec63a619' 
  AND token = 'JFg4QnoAsvXK8JS3/XVh9+yoYFegOE9bIp2uDnTGgqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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