SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '806c82b49eb7c0d8ea17bebba83c87966683e06b1b68de984f08854efe0fd512' 
  AND token = 'zZiOjk6a7mwtFo/QFkuNrIeZ+RV6+XNBGjmZvB/5O3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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