SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2de1396f625159f2f839b66e80eb84cabeb067f8ecd4df72ea3fb5f28175e25' 
  AND token = 'AO6hFz9NXkKJck0ms5DmY9p1xLjFYBdz4jKDnYG81yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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