SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be970f1805f36599cf2c2c2bf62c2b83913b94955854ea9e528152f4935b6ff6' 
  AND token = 'ITDP8PlgYDTZ91Ko4WSGwXTHCHlXntcFSB4FaoDvxJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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