SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '081c50d80571b4fdc32ee5c649eb21e9e258232e6fbbfccef664bd7d340847bd' 
  AND token = 'LaSDwlrWh1ZQSTU+TVyjK+nsZW0GPgS2MGzM+hJJzlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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