SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa297b62c5f841cc2b3c9a277ce3f225d5a9384f18e4c0dcc8c10e69f47b45de' 
  AND token = 'JqTTu/pL64mXPVb9CDGCzZY4NWpFOP43SVC6jsDDe2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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