SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'baa6da8854e04cfafa5078c930e3f594082ab3f7242ea96877920de101f7f1de' 
  AND token = 'vGwYE4hmGm6Y+XNjN0xgxKN4oavnLvezsJUdOHvfAZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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