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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6538707a9934660e9f88ca866cf9b89cfd32976ff6c7bdbe740970c5e8c3f155' 
  AND token = '4ldQ21TFn5vdFxvJ1IjrobIgzb9kr3oFCcSUSkpzzMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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