SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64a724a1d11286217db9961f2537dab1a8b5d8ce4f03c72552a4c01bb888a76f' 
  AND token = 'ch+cq+D9GTIQjx6rmPZpfGMvpim3WwMZ+VFjW1qjTUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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