SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e02524a688ffb0826ff44967bd9f8dacf63aea9a1ddbdd9cfd1344dd06cdb27' 
  AND token = 'Vwj0W5Oz7ZUKP5Lr2udJ0FQBTqw3YbRapeM4T3jFxv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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