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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a6ec0a6b248c4e3b74cc48f2a7f85fe4f7b587350980748fcdf34458e3f509f' 
  AND token = 'Q14WBxpje1eCSjaYVJFR7A3yHuHSrh4bq0k/FgFitLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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