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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a8eef276b7ce355ed05da5973bf86eda22a70f0d778028d271d8d01488aba99' 
  AND token = '8iLGMYN13FxL0KK5AIT7yFbr/VWNFtzGmypsURSdApk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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