SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98f052ad3b03520ed488b879f350f3a8c946d14f93de0f1ef4fe5034585e81e8' 
  AND token = '/GwxQwvML6Mz2cd4GfOSKZnYMgqFE/Qb3ZHM/tltZXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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