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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9c12ec04e9d5bdccc4d5bb66a19f000936fb09ab633a73f581be0d45c864fd3' 
  AND token = 'B2Yy4rFM5SqMzPSrjPELs2YLtTcLtuw4MGyPQiOVpIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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