SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c3d7b6cce840db716323130d43af579f657e97b2385c20d4519061d48ea4a3d' 
  AND token = 'tpeOpUrjD/lCIIT4HqCkVKbZQeqgPfrUD/r49KHf18g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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