SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05e4f396d09e9873ba693e151f77c48f93d7a953494c750b412ac72d59ef9169' 
  AND token = 'UZy6R/UhmlYl4fsJQRWAF3OMgrptCA4g9+KH/8vCvbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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