SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb5eef3f472e3717bc12569f2e383838be74edf3f87998cafc8a09cc04a228b4' 
  AND token = 'kzn+c6bm6+J4JmrVk929KIQs6yZpqFZEPCdLuC/+xgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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