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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cf87e60d39aa4cacc2503013aaa309f7a4b131e7fbe0dd123254cc19f2af888' 
  AND token = 'fc1nPmSdwX6Rz6kN5mxTnIMLwGk9oc6xNuUT2rDrvWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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