SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f01d7a548b5b82114822f6d2bc5b21b0e63d8b84dcae636858259f49e2aafaee' 
  AND token = 'B3Jj82y0BvCvxoxS7bq/FFhT11qn0xtzoKX6zVyvInc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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