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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25020dc49918a43e5fecbf6c1537a7da8b9aa8d750ac9118b5b80da6ae0ccf67' 
  AND token = '/eEyQJcnQoGRzaIUMk/c1WtL27GMb7hKR3iOHTlgjO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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