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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f60aaa7ff938bee1775ebdf9efeaf9d6d4bb6d330a254cf6102cda113a25d6b3' 
  AND token = 'tsxUEl1s06gUVht8l10gGyQfxNzvEOfDVtw4ItBXxn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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