SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e819726ade5820cbbec84c40783549c602523e94302e340029ab76f4b215ff1b' 
  AND token = 'dVse+z62MOMHjOGTbSCE+HtzHfZRiAl19h8rCOkKBBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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