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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a8e13167a27eaecaac260f4e9deb0bf27871f81156c6734a2002bb4451a9c72' 
  AND token = '363aLL1RJQHLEwuvbOobSycJ6gUAmu7wXJd1r/DPLXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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