SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfdb27f115c50c9ac2307b54f969a578913df0acb6b2b0ae0fe2e56c9cbe02a4' 
  AND token = 'GZ7u9zKh34TmXXo+fs8TLuDy4KueOVyTDJyYB87j4zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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