SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06ce95242e5f77669171ca0f672f8b4ef6e7ef63e885b43bdc1a99f6c12ccc87' 
  AND token = 'SQjDByDO/X3vm4OwtlTwqoslgCigq5jtj2WVIs3jeyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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