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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98ea3e8fa1b005189b39f67a211319cdc253ac401a7ca071c57de71e441542d7' 
  AND token = 'vizTxquma1Ayu8BmERXsUMhh0pxGW1e5KMWrB7k9phU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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