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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '902d02bf444a8a7a71040c1bbd431dfbd82b266bf11e04c29b8d6f297d914200' 
  AND token = '58WzNVeYTzSkMrwJbH0MBElgCLcCb8m42y99oMBKXFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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