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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e8b9697515ba703c331b3fa4641e40b3e4928bd62752256312346bb0a3669ea' 
  AND token = 'jQk0wk+UWC8e/k/QwjSMEqSxPa2ukfpbXs2WsYNWdx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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