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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9bb2537a631b4ce28b74085f4de4677f7aa95f6ff08df30a95ef50df56e941be' 
  AND token = 'd3XurisUHXcYpOYNshE0ktxQkGGOc0CBNRCwgrm1jdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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