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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fd5dc4bc41c4870deedf6a46312799ed1e33097662f70d5029afe20d37917ea' 
  AND token = 'rzRKRsISOsTyR8FAajv10aWNNzMdm7DWqV75vClA3Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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