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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da251629074c57e5982aefc066d2e2a4a7b328cc712b5504138beac245945cbf' 
  AND token = 'VvrWYm8MwzkJ7ppA7iyuogGvf52463b6J9Wvs7aFrTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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