SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd12fc6e36a04017756c24685a1e500e2201323020fa96ac40fee12486980dbf' 
  AND token = 'Ypjhv/r3pEegbGdKWA9sFmmaePueoSOOgHlwDFq54JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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