SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f349a8dd999f769d5af5087c83f1d7c7c0da5419359c8d8fb1f4a86164adff44' 
  AND token = '6N3A5NBMTJ8zCwJh4oIq/C1J6ODv4KzCZ+N0S/xueLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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