SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7da86c7e9a5f7d3c24081f75dad900c8065a8de2205c4dc2b45e260ef3412041' 
  AND token = 'PnDO0CRhyZg9zFUSRFyezNp+/aHvzkY1E/S+KchiMnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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