SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9bf0594f85519a81e2e91b6149a9b7f3319f9985bedca37ef58e4b55c764820f' 
  AND token = 'uS+KIwpH/MiyJcwR26W8YtnUZrZEqXC0nZ7ebzWYKVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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