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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '829ae5ec3f00ceb8f728a088a8b7f1a77dfac7f0014faa6c6dff6320ae49b97c' 
  AND token = 'iwpsJsnXdCi85Zv4o6iQcSXQZxhgiv2SOZy5iaBVJNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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